GOLDEN STARS MONTESSORI ACADEMYArial;
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DIGITAL TECHNOLOGY
JSS 2 CLASS NOTE
TOPIC: Components of a Computer Network
CORE CONCEPTS
A computer network is a group of two or more connected computers and devices that can share resources and information. For these devices to communicate, they need special parts, just like a car needs an engine, wheels, and steering to move. These special parts are called network components.
KEY POINTS
Let's learn about the main components that make up a computer network:
A server is a powerful computer that provides data, services, or resources to other computers (clients) on a network. Think of a server as a big library or a central store where files, websites, and applications are kept. When you want to access a website or save a document on a shared drive, a server helps you do that.
A client is a computer or device (like your desktop computer, laptop, tablet, or smartphone) that requests and uses services or information from a server. When you browse the internet or open a file from a shared folder, your device is acting as a client, asking the server for what you need.
A switch is a smart device that connects multiple computers and devices within the same network. It receives data from one device and sends it only to the specific device it is meant for. This makes data transfer very efficient and fast within a local network, like in a school computer lab.
A router is a device that connects different computer networks together. It acts like a traffic controller, directing data packets between your home network and the internet, or between different networks in a large organization. Routers make sure that information sent from your computer reaches the correct destination on another network.
A hub is an older and simpler device used to connect multiple devices in a network. Unlike a switch, a hub is not "smart." When it receives data, it sends that data to all connected devices, even if it's only meant for one. This makes hubs less efficient and less secure than switches, so they are rarely used in modern networks.
Network media are the physical pathways through which data travels from one device to another in a network. There are two main types:
a. Cables
These are physical wires that carry data signals.
i. Ethernet Cables:
These are the most common type of network cables, often called "network cables." They are used to connect computers, switches, and routers over short distances, providing a fast and reliable connection.
ii. Fibre Optic Cables:
These cables transmit data using light pulses. They are much faster and can carry data over longer distances than Ethernet cables, making them suitable for connecting large networks or even countries.
b. Wireless
Wireless connections use radio waves to transmit data through the air, without the need for physical cables. Wi-Fi is the most popular wireless technology. It allows devices like laptops, smartphones, and tablets to connect to a network or the internet from different locations within a certain range, offering convenience and flexibility.
SUMMARY
Computer networks rely on several key components working together. Servers provide resources, while clients access them. Switches connect devices efficiently within a local network, and routers connect different networks to each other, like your home to the internet. Older hubs are less efficient. All these components use network media, either physical cables (like Ethernet or fibre optic) or wireless signals (like Wi-Fi), to carry data and enable communication across the network.